Power hack saw



J. P. O'HERN 2,206,614

POWER HACK SAW Filed Aug. 5, 1939 2 Sheets-Sheet l INVENTOR.

I By ATTORNEYS.

July 2, 1940. O'HERN 2,206,614

POWER HACK SAW Filed Aug. 5, 1959 2 Sheets-Sheet 2 IN V EN T OR.

ATTORNEYS.

Patented July 2, 1940 e t UNITED STATES PATENT OFFICE POWER HAC'K SAW John P. OHern, Syracuse, N. Y.

Application August 5, 1939, Serial No. 288,650

2 Claims. (CI. 29-73) This invention relates to portable tools the A securing screw indicated by the reference primary object of the invention being to provide character 8 extends through an opening of the a hand tool including a motor and motor supsupport, and has its inner threaded end seated port, so constructed that the motor and its supin a threaded opening of the motor casing, inport may be readily removed from the frame of suring against movement of the motor with re-= 5 the tool, and used as a drill by supplying the spect to its support. usual drill chuck and drill to the motor shaft The motor support includes a handle of the thereof. i pistol-grip type indicated at 9, the handle being Another object of the invention. is to provide provided with a switch In so that the electric 119 means for converting rotary movement of the current to the motor 6 may be readily controlled. l9 motor shaft to reciprocatory movement for oper- The frame of the tool includes an, upper bar ating the blade of a hack saw, the gearing be- H that is secured to the front end of the motor ing such as to insure an even and direct power upport 5, by means of the screw 12, the forbeing directed to the saw blade of the tool. ward end of the bar H extending downwardly A still further object of the invention is to as at I3, where it provides a support for the provide means for balancing the movement of bearing member M, which is shown as boltedto the saw blade, to the end that vibrations of the the downwardly extended end of the bar. This saw blade are eliminated. I bearing member 14 is hollow providing a cylinder n With the foregoing and other objects in view, for the washer l5 carried at the forward end of which will appear as the description proceeds, t e Saw rod l5 Wh ch s shown as Operating the invention resides in the combination and arthrough a bearing opening formed in the bear-,

rangement of parts and in the details of coning member M. A coiled spring indicated at H struction hereinafter described and claimed, it s ou ted Within the cylinder cd n the being understood that changes in the precise embe e ber and is disposed between bodiment of the invention herein described, may the W s 5 a O e e d of e y er, to

be made within the scope of what is claimed, the end that when the saw rod I 6 moves in one without departing from the spirit of the invenon, the p g Will be compressed, t u

tion. t the saw rod H5 in the opposite direction. It will n Referring to the drawings: be seen that this spring cushions the movement Figure l is a side elevational view of a tool of the saw rod l6 and insures smooth running constructed in accordance with the invention and of the saw. 7 illustrating the motor and its supportas form- The saw which is indicated at 18 is connected ing a part of a hack saw structure. to one end of the saw rod l6, by means of the Figure 2 is an, enlarged elevational view of the bolt Hi, the Opposite end of the saw being contool, illustrating the motor support and portions nected to the rod 26 that moves through the of the frame of the tool as in section. bearing 2| formed within the gear housing, which Figure 3 is a sectional view taken on line 3-3 forms a part of the frame of the tool. The gear of Figure 2. housing is indicated by the reference character Figure 4 is a sectional view taken on line 4-4 22 and is of a construction to fit over the forward of Figure 2. p e end of the motor support 5, where it is held in Figure 5 is a sectional view taken on line 5-5 position by means of the screws 23. of Figure 2. I i Formed within the gear housing 22 is a parti-' Figure 6 is a sectional view taken. on line 6-6 tich 24 W c s p v ded W a bearing to of Figure 2; accommodate the vertical shaft 25 that has its Referring to the drawings in detail, the referupper end operating in the bearing 26, the lower ence character 5 designates the motor support, end of the shaft 25 extending through the par- Which is provided witha recessed portion for the tition 25, where it is supplied with a disk 2?. reception of the motor 6, the wall of the recessed Extending from the disk 21 is an eccentrically portion being formed with keyways for the recepdisposed pin 28 on which the roller 29 is mounttion of the keys l formed on the sides of the moed, the roller 29 operating within the member tor E, the keys contacting with the walls of the 30 which is formed with a cam groove 3|. This grooves, to prevent rotary movement of the motor member 35 is provided with an extension 32 at within the recess, and at the same time insure one end thereof, the extension 32 operating in the proper positioning of the motor within the the groove 33 formed in the inner surface of the motor support. I gear housing 22, so that movement of the memher 30 is guided in a true horizontal plane at all times.

As clearly shown by Figure 2 of the drawings, the member 32 is secured to the rod 20, to the end that as the disk 21 is rotated, the pin 28 and roller carried thereby, operating in the cam groove, will cause the rod 20 to reciprocate and operate the saw blade l8 connected therewith.

Secured to the shaft 25, is a pinion 34 that meshes with the pinion 35 removably secured to the motor shaft 36.

The member 30 also moves under the guide rod 31 that is mounted in the lower portion of the frame, a' motor support including a handle havgear housing, further securing the member 30 against vibrating while in operation. From the foregoing it will be seen that due to the construction shown and described, I have provided a hand tool which may be readily and easily disassembled, and the motor together with its support used in the capacity of a drill, by merely removing the gear 35 and replacing the gear with the usual drill chuck and drill bit.

motor including a shaft, a pinion on the forward end of the shaft, a vertical shaft within the gear housing, a pinion on the vertical shaft rotating in a horizontal plane, the pinion on the motor shaft adapted to mesh with the pinion on the vertical shaft when the motor support is positioned adjacent to the gear housing, a reciprocating saw blade carrying rod mounted within the gearing housing, and means for transmitting movement of the vertical shaft to the reciprocat ing rod, operating the rod and saw blade carried thereby. v

2. A motor-operated saw comprising a frame, an open-ended gear housing at one end of the ing a recess adapted to extend into the gear housing,-a motor including a motor shaft mounted within the recess, a reciprocating rod mounted Within the gear housing and to which a saw blade is secured, a member having a cam groove, secured to the rod, the groove being disposed upwardly, .a Iverticalshaft mounted within the gear housing, a disk having a pin extending therefrom, mounted on the lower end of the to said vertical shaft.v

JOHN P. OHERN. 

